Structural magnetic glassiness in the spin ice Dy2Ti2O7
Structural magnetic glassiness in the spin ice Dy2Ti2O7
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自旋冰中的结构磁玻璃态 Dy2Ti2O7
DOI：
10.1103/physrevresearch.4.033159
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发表时间：
2022
影响因子：
4.2
通讯作者：
Zhou, Haidong
中科院分区：
文献类型：
--
作者：
Samarakoon, Anjana M.;Sokolowski, André;Klemke, Bastian;Feyerherm, Ralf;Meissner, Michael;Borzi, R. A.;Ye, Feng;Zhang, Qiang;Dun, Zhiling;Zhou, Haidong
玻璃动力学的起源和性质是凝聚态物理学的核心谜团之一，涉及从窗玻璃到自旋玻璃的广泛系统。自旋冰化合物，这可能是最有名的托管一个三维库仑自旋液体与磁荷双激发，也福尔斯了平衡在低温下。它如何以及为什么这样做仍然是一个悬而未决的问题。基于低温扩散中子散射实验采用不同的冷却协议，以及最近的磁噪声研究的分析，结合广泛的数值模拟，我们认为，冷却后，自旋冻结成什么可以被称为“结构磁性玻璃”，没有anpriorineed的化学或结构紊乱。具体来说，我们的模型表明存在两个层面上的挫折，首先产生一个近退化的约束流形内的相序动力学反过来受挫。一个显著的特征是，磁单极子充当自旋网络的唯一退火器，并且它们的路径和历史编码了玻璃动力学的发展，使得玻璃形成可视化。我们的研究结果表明，自旋冰提供了一个原型的磁性玻璃形成具体和设置动力学约束系统的研究更普遍。
The origin and nature of glassy dynamics presents one of the central enigmas of condensed-matter physics across a broad range of systems ranging from window glass to spin glasses. The spin-ice compound, which is perhaps best known as hosting a three-dimensional Coulomb spin liquid with magnetically charged monopole excitations, also falls out of equilibrium at low temperature. How and why it does so remains an open question. Based on an analysis of low-temperature diffuse neutron-scattering experiments employing different cooling protocols alongside recent magnetic noise studies, combined with extensive numerical modeling, we argue that upon cooling, the spins freeze into what may be termed a “structural magnetic glass,” without anpriorineed for chemical or structural disorder. Specifically, our model indicates the presence of frustration on two levels, first producing a near-degenerate constrained manifold inside which phase ordering kinetics is in turn frustrated. A remarkable feature is that monopoles act as sole annealers of the spin network and their pathways and history encode the development of glass dynamics, allowing the glass formation to be visualized. Our results suggest that spin iceprovides one prototype of magnetic glass formation specifically and a setting for the study of kinetically constrained systems more generally.